Table 4-2  Summary of computations illustrating application of the rational method to storm-sewer design. (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21) (22) (23) (24) 1 1-6 1-5 400 2.64 2.64 20.0 1.4 0.3 3.7 1.11 2.93 0.85 12 3.3 4.0 4.6 9 ... 3.40 93.0 89.6 98.4 94.9 1 1-5 1-4 400 3.61 6.25 21.4 1.2 0.3 3.6 1.08 6.75 0.75 18 9.2 5.1 5.6 11 0.40 3.00 89.2 86.2 94.9 91.8 1 1-4 1-3 400 3.88 10.13 22.6 1.2 0.42 3.4 1.43 14.50 0.45 24 15.2 4.8 5.6 18 0.40 1.80 85.8 84.0 91.8 89.7 3 3-2 3-1 400 5.55 5.55 20.0 1.1 0.3 3.7 1.11 6.16 1.00 15 6.4 5.1 5.9 12 ... 4.00 91.0 87.0 96.2 92.3 3 3-1 1-3 400 6.43 11.98 21.1 1.1 0.3 3.6 1.08 12.92 0.60 24 17.5 5.5 6.1 15 0.60 2.40 86.4 84.0 92.3 89.7 1 1-3 1-2 400 3.92 26.03 23.8 1.10 0.39 3.3 1.29 33.60 0.30 36 37.0 5.1 5.9 26 0.80 1.20 83.2 82.0 89.7 89.5 2 2-1 1-2 400 2.52 2.52 20.0 1.4 0.3 3.7 1.11 2.80 0.90 12 3.2 4.1 4.7 9 ... 3.6 87.5 83.9 92.7 89.5 1 1-2 1-1 400 3.86 32.41 24.9 1.1 0.41 3.2 1.31 42.50 0.24 42 50.0 5.2 5.9 29 0.40 0.96 81.6 80.64 89.5 88.5 1 1-1 Out-fall 125 5.44 37.85 26.0 ... 0.44 3.2 1.41 53.20 0.30 42 56.0 5.7 6.6 33 0.1 0.38 80.54 80.16 88.5 ... KEY (1) Line; (2) Manhole, From; (3) Manhole, To; (4) Length, ft; (5) Area, increment, acres; (6) Area, total, acres; (7) Flow time, to upper end, minutes; (8) Flow time, in section, minutes; (9) Average runoff coefficient; (10) Rainfall, in/h; (11) Runoff, ft2/s/ac; (12) Total runoff, ft3/s; (13) Slope of Sewer, percentage; (14) Diameter, in; (15) Capacity, full, ft3/s; (16) Velocity, full, ft/s; (17) Design flow velocity, ft/s; (18) Depth of flow, in; (19) Manhole invert drop, ft; (20) Fall in sewer, ft; (21) Sewer invert, upper end; (22) Sewer invert, lower end; (23) Ground elevation, upper end; (24) Ground elevation, lower end.